synthesizer.load_data.load_simba

A submodule for loading Simba data into Synthesizer.

Load Simba galaxy data from a caesar file and snapshot.

Method for loading galaxy and particle data for the [Simba](http://simba.roe.ac.uk/) simulation

Functions

synthesizer.load_data.load_simba.load_Simba(directory='.', snap_name='snap_033.hdf5', caesar_name='fof_subhalo_tab_033.hdf5', caesar_directory=None, object_indexes=False, load_halo=False, age_lookup=True, age_lookup_delta_a=0.0001)[source]

Load Simba galaxy data from a caesar file and snapshot.

This function can load all objects or a specific subset based on their indices. It uses the slist and glist datasets from the Caesar file to correctly map particles to their host galaxies/halos.

Parameters:

  • directory (string) – Data location.

  • snap_name (string) – Snapshot filename.

  • caesar_name (string) – Caesar file name.

  • caesar_directory (string) – Optional path to the Caesar file if it’s in a different directory from the snapshot.

  • object_indexes (list or bool) – List of object indices to load. If False, all objects are loaded.

  • load_halo (bool) – If True, loads halo objects instead of galaxy objects.

  • age_lookup (bool) – If True, creates and uses a lookup table for stellar ages for faster age calculation.

  • age_lookup_delta_a (float) – The resolution of the age lookup table in terms of scale factor.

Returns:

A list of synthesizer.particle.galaxy.Galaxy objects.

Return type:

galaxies (list)

synthesizer.load_data.load_simba.load_Simba_slab(directory='.', snap_name='snap_033.hdf5', bounds=None, load_stars=True, load_gas=True, load_dark_matter=False, age_lookup=True, age_lookup_delta_a=0.0001)[source]

Load a cuboid region of Simba simulation data into a Galaxy object.

This function loads all particles within a specified cuboid region from a Simba snapshot, regardless of which galaxy they belong to, and creates a single Galaxy object containing all particles in that region.

Parameters:

  • directory (string) – Data location.

  • snap_name (string) – Snapshot filename.

  • bounds (array-like) – Cuboid bounds as [[xmin, xmax], [ymin, ymax], [zmin, zmax]] in physical Mpc units.

  • load_stars (bool) – If True, loads stellar particles (PartType4).

  • load_gas (bool) – If True, loads gas particles (PartType0).

  • load_dark_matter (bool) – If True, loads dark matter particles (PartType1).

  • age_lookup (bool) – If True, creates and uses a lookup table for stellar ages for faster age calculation.

  • age_lookup_delta_a (float) – The resolution of the age lookup table in terms of scale factor.

Returns:

A Galaxy object containing all particles in the specified region.

Return type:

galaxy (synthesizer.particle.galaxy.Galaxy)